ST. LOUIS COUNTY (KSDK) - A Freon leak in the HVAC system of a locker room forced an early dismissal Thursday at Cross Keys Middle School.
CKMS has had reports of a mysterious smoke or fog in the gym and boys locker room over the past two days, prompting several evacuations on Wednesday and Thursday, according to Ferguson-Florissant School representative Jana Shortt.
Two students told administrators that they were not feeling well and were seen by the school nurse, but no medical attention was required.
Florissant Fire Department and Laclede Gas officials have determined the air quality in the building is safe, and the Freon poses no health threats.
The leak stopped when the HVAC unit was turned off Wednesday but was turned on Thursday morning to heat the boys' locker room. When the unit was turned on, the fog reappeared.
The school cancelled all evening activities so that the system could be repaired.